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采用不同官能团如苯二甲酸(TA)、聚乙二醇(PEG,Mn=1000)对聚丁二酸丁二醇酯(PBS)主链进行共聚改性,得到了基于PBS的均聚共聚物PBST;嵌段共聚物PBES。利用1H-NMR、GPC、WXRD、热分析、拉力试验对共聚物的化学结构、相对分子质量、结晶性、热性能及力学性质的影响进行了研究。结果表明:将TA、PEG引入PBS的主链,在较短时间内得到了数均分子质量约5万的无规PBST和嵌段PBES共聚物;PEG的介入使聚合物的结晶度降低、断裂伸长率大幅度增加,最大达846.4%;TA的介入则使其结晶度增加,断裂伸长率呈逐渐减小的趋势,但仍比PBS有所增大;两种聚合物均有良好的热稳定性。
The main chain of polybutylene succinate (PBS) was copolymerized with different functional groups such as phthalic acid (TA) and polyethylene glycol (PEG, Mn = 1000) to obtain PBS-based homopolymer PBST; Block copolymer PBES. The influence of the chemical structure, relative molecular mass, crystallinity, thermal properties and mechanical properties of the copolymer was studied by 1H-NMR, GPC, WXRD, thermal analysis and tensile test. The results showed that TA and PEG were introduced into the main chain of PBS, and random PBST and block PBES copolymer with number average molecular weight of about 50,000 were obtained in a short time. The intercalation of PEG reduced the crystallinity of the polymer and ruptured Elongation increased significantly, up to 846.4%; TA intervention crystallinity, elongation at break showed a trend of decreasing, but still increased compared with PBS; both polymers have good Thermal stability.